Mini Split AC Question

Hey mans,

I'm running a 6k room right now with a 24,000 BTU Aircon Mini Split System. Everything is great but I have a problem.

Because this AC doesn't have a programmable thermostat I cannot leave anywhere because the AC has to be turned on every single morning and turned off every single night. Why the hell would they make a unit like that?

Is there anything else I can do so this automatically runs so I can leave for business over the weekend?

Thanks.

howdy weedz, if you turn the unit set to lets say 55F then unplug or turn off the power then turn the power back on will the unit have the 55F setpoint saved meaning it will start running again? if so i could explain a simple circuit you could build and use any thermostat you would like. the thermostat would turn power on and off to the unit. let me know

I've never installed that brand, so I'm not particularly familiar with their controls. I know with Mitsubishi and fujitsu, their thermostat is the remote control. And it will bring the unit on and off keeping you at or within a few degrees of your wet point. They both also have hardwired thermostat options for some of their models

You could wire in a timer and for the more hvac savy, I've seen guys wire thermostats. Maybe the thermostat was just not included.

Thank you for your replies. My HVAC tech said the same thing. We could hardwire a thermostat but I could use more info please @motoracer110 I appreciate it.

And yes, so I have it set at 70 degrees. The night before I have to set the timer to turn on 12 hours later at 8am. at 8am the unit turns on at 70 degrees. At 8pm I turn the unit off and then set the timer again for 12 hours 8am. And so on every day.

right on weedz. 3rd generation hvac tech to the rescue . Pretty much all you need is a small step down transformer going from 120v to 24v, a tstat, a 24v coil contactor (double pull double throw) and a project box to keep things safe. the way t-stats work is the R or red wire is always the hot 24v wire and the tstat when calling for cool will connect the R to the Y or yellow wire back down to the ac system to turn it on. so on the contactor you would wire hot 120 coming from your wall to one side of the contactor. then wire your ac unit to the other side of the contactor. The side clips on the contactor need 24v to the little coil to pull the contactor in and send power to your ac system turning it on. you want to send another hot 120v line to one side of the transformer then the 24v off the transformer goes to R (red) on the tstat then wire Y (yellow) to the coil of the contactor as a little loop. with all that done the tstat will be turning on and off the ac system. and any normal t-stat that has cooling on it will work. i made a quick 10 min drawing of the circuit sorry dont know how to rotate.

NinjaShamen said:

I know with Mitsubishi and fujitsu, their thermostat is the remote control.

Click to expand...

Is this really true? So the remote control should be in the area needed cooling, not in the hallway out side of the are needed cooling?

NinjaShamen said:

I've never installed that brand, so I'm not particularly familiar with their controls. I know with Mitsubishi and fujitsu, their thermostat is the remote control. And it will bring the unit on and off keeping you at or within a few degrees of your wet point. They both also have hardwired thermostat options for some of their models

Click to expand...

Been told by many a tech. Mitsubishi is the one to buy. Also told that you must keep them ultra clean for extended life.
My tech had one. He put in my central system and drooled. he took his Mitsu's covers off the condenser unit twice a year to get it as clean as possible. He said if you don't, it won't last as long as it should.